\(\dfrac{-3}{7}+\dfrac{15}{26}-\left(\dfrac{2}{13}-\dfrac{5}{17}\right)\)
\(=\dfrac{27}{182}+\dfrac{31}{221}\)
\(=\dfrac{893}{2094}\)
\(\dfrac{-3}{7}+\dfrac{15}{26}-\left(\dfrac{2}{13}-\dfrac{5}{17}\right)\)
\(=\dfrac{27}{182}+\dfrac{31}{221}\)
\(=\dfrac{893}{2094}\)
12 phan 19 . 7 phan 15. -13 phan 17.19 phan 12 . 17 phan 13
-3 phan 13 nhan 7 phan 17 + 3 phan 17 nhan -14 phan 13 + 10 phan 3 phan 13
tính bằng cách hợp lý
3 phan 7 . 9 phan 26 - 1 phan 14 . 1 phan 13 - 1 phan 7
9 phan 14 + 8 phan 21
13 phan 15 - 7 phan 12
7 phan 5 x 15 phan 49 -22 phan 15 : 7 phan 5
Thuc hien phep tinh :
a) 4 phan 5 + -7 phan 15 . 1, 25
b) 2 phan 5 + 3 phan 5 . ( 4 1phan2 - 3,25)
tim phan so biet rang phan so co tu bang 4 biet rang phan so do co phan so \(\frac{13}{17}\)va nho ho \(\frac{13}{15}\)
1 13 phan 15 nhan 0 phay 75 tru (11 phan 20 cong 25 phan tram ) chia 7 phan3
quy đồng mẫu các phân số sau:
-2 phần 9 va 4 phan 25
1 phan 15va -6
11 phan 120 va 7 phan 40
24 phần 146
7 phần 30,13 phan 60,-9 phan 40
17 phần 60,-5 phần 18,-64 phần 90